我猜他大概 30 岁。用英语怎么说 ? 

我猜他大概 30 岁。的英语翻译是:

I guess he's about 30.

句子单词讲解

1. guess
单词释义: vt.推测;猜测,臆测;猜中;假定,认为vi.猜,猜测;猜对n.猜测;推断
应用场景: CET4|TEM4|考 研|CET6
相关短语:
你能猜到今天上午我在做什么吗?
Can you guess what I was doing this morning?
我妈给我发了一封挂号信,我想她有什么重要的事情要说。
My mother has sent me a registered letter, I guess she has something important to tell me.

2. about
单词释义: prep.关于;大约;在…周围adv.大约;在附近;在四周;几乎adj.在附近的;四处走动的;在起作用的;在流行中的
应用场景: CET4|TEM4|考 研|CET6
相关短语:
你呢?
What about you?
我知道有关它的一切。
I know all about it.
他并不在乎我。
He doesn't care about me.

3. 30
单词释义: thirty
相关短语:
让我查查,她周二下午有 30 分钟。
Let me see. She has 30 minutes Tuesday afternoon.